PRESIDIUM PCS-100 Manual De Instrucciones página 16

In case a "Vessel" is required, place it on the weighing
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arm, press "TARE" to offset the weight of the vessel.
Tips for using your Presidium Carat Scale
Keep the transparent lid closed when the scale is in
operation.
It is advisable to take multiple readings if any doubt exists
regarding the test results indicated.
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